Liersch R
Arch Microbiol. 1976 Sep 1;109(3):321-2. doi: 10.1007/BF00446646.
The stability against mutation of essential oil formation in the genus Chlorella is similar to that of hydrogenase. Both characters are therefore of special value in Chlorella taxonomy. All the 21 mutants of C. fusca C-1.1.10 produce essential oils, but only a few of them produce proazulenes. Two mutants of C. kessleri C-1.1.12 produce essential oils and proazulenes like the wild type.